In composite materials, volumetric fracture is used in some calculations and weight fraction, how to choose?

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Kadhim K. Resan Popular answer

Why (Paricle composite materials used weight fraction but fiber composite materials used volume fraction )?

Tariq Ouahbi

There is a direct relation between the fiber volume fraction and the fiber weight fraction.

The first one is equal to the second multiplied by the ratio of fiber density vs composite density.

Mahmud M.S. Dwaikat

Simply, if your equations require volumes, or if they require weights. No magic is there. Most "elastic and statics" relations require volumes, while dynamics properties require mass to be involved.

Kadhim K. Resan